Hello, I have looking at buying my first sewing machine. I have researching differant makes I have beeen looking at the cowboy 4500, the tecsew 5100, and the cobra class 4. To me all of these machines look to have the same exact cases and all of the specs look to pretty much be the same. Are they all manufactured or assembled in the same place then just getting differant paint and stickers or are they actually differant?